Razor blade having cam means on opposite sides of the cutting edge



Oct. 4, 1966 R. R. LARSON 3,273,121

. RAZOR BLADE HAVING CAM MEANS ON OPPOSITE SIDES OF THE CUTTING EDGE Original Filed May 15, 1965 Roger R. Larson INVENTOK.

United States Patent 3,276,121 RAZOR BLADE HAVING CA'M MEANS 0N OPPO- SITE SIDES OF THE CUTTING EDGE Roger R. Larson, 3244 N. University Ave., Decatur, Ill. Original application May 15, 1963, Ser. No. 280,560 now Patent No. 3,238,617, dated Mar. 8, 1866. Divided and this application Oct. 21, 1965, Ser. No. 499,834

4 Claims. (Cl. 30-346) This invention relates to improvements in razor blades and safety razors therefor, and is a division of applicatlon Serial No. 280,560, filed May 15, 1963, which has inatured into Patent No. 3,238,617 granted March 8, 1966.

It is the primary object of this invention to provide for a rapid cutting motion of a double edge razor blade without pulling the razor blade holder too fast over the shaving area of the face, thus combining the safety of slow movement of the razor blade holder with the advantage of fast cutting action.

The aforementioned object is accomplished by the use of a double edged razor blade on which a plurality of cams are disposed. By means of these earns, the blade is adapted to be moved upward and backward and then downward and forward to increase the cutting action of the blade on the shaving area.

A further object of this invention resides in the use of a cam wheel mounted on the holding portion of the razor which cooperates with the cams on the blade to push the blade along a cam track formed in the holder to impart the requisite upward and backward movement to the blade. The blade is then returned along the foregoing path by a return spring incorporated in the holder thereby imparting downward and forward cutting action to the blade.

Still another object of this invention resides in imparting to the razor blade a reciprocal and transverse motion which precludes a gouging effect on the shaving area.

Yet another object of this invention is to provide a device of the character indicated which is of a simple and practical construction, which is eflicient and reliable in operation, neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a top plan view of the razor and mounted blade of the instant invention.

FIGURE 2 is a view in side elevation of the razor shown in FIGURE 1.

FIGURE 3 is a view in end elevation of the razor shown in FIGURE 1.

FIGURE 4 is a bottom plan view of the removable top portion of the razor.

FIGURE 5 is a sectional view taken substantially along the plane indicated by the line 55 of FIGURE 2 with two of the springs used to urge the razor blade outwardly removed for purposes of clarity.

FIGURE 6 is a sectional view taken substantially along the plane indicated by the line 66 of FIGURE 2.

FIGURE 7 is a fragmentary sectional view taken substantially along the plane indicated by the line 77 of FIGURE 1.

FIGURE 8 is an enlarged perspective view of the blade per se.

Referring now to the drawings in detail, the razor blade holder or razor used in the instant invention is generally designated by the numeral 10 and comprises a handle porice tion 12, a body portion 14, and a top portion 16. The top portion 16 has mounted thereon a pair of spaced roller bearings 18 and 20 for cooperation with a pair of roller bearings 22 and 24 journaled on the body portion 14 to clamp a razor blade 26 therebetween. Also attached to the top portion 16 is a razor blade mount generally indicated by the numeral 28 over which a razor blade is adapted to be slid and positioned. Extending from the mount 28 are a pair of spring supports 30 and 32. A pair of apertures 34 and 35 are also spaced on the top portion 16 for the reception of upstanding pins 36 and 38 carried by the body portion 14. As shown in FIGURE 5, the pins are adapted to extend through slots 40 and 42 in the razor blade for positioning the same. The razor blade mount 28 further comprises a depending threaded member 44 which is received in a threaded bore 46 in the handle portion 12 of the razor to thereby effectively clamp all the parts together.

The razor blade 26 has a pair of sharpened cutting edges 48 and 50 as well as having a cross shaped groove such as 52 cut in the center portion thereof. The groove 52 is used to position the blade upon the top portion 16 of the holder 10. The lateral portions of the cross shaped groove 52 are adapted to accommodate four springs such as 54 which tend to urge the blade outwardly of the holder. These springs are mounted on the spring supports 30 and extend upwardly through the groove 52 and contact the lateral side edges thereof. Since a pair of springs tend to urge the blade in opposite directions the force of the springs is neutralized to thereby maintain the blade in the position indicated in FIGURE 5.

Journaled on each end of the body portion 14 of the holder 10 are a pair of spaced cam wheels 56 and 58, respectively. Mounted on each of said wheels are a plurality of cams or camming teeth such as 60, each of which is adapted to engage a cam such as 62 formed on and along the full length of the bottom of the blade 26 adjacent the corresponding edge 48 or 50. One of said cam wheels such as 56 is adapted to engage the shaving area of the users face and upon the razor being pulled downwardly along the shaving area the cam wheel 56 will rotate in a clockwise direction as viewed in FIG- URES 3 and 7 thereby causing the blade 26 to move inwardly of the razor due to the contact of the cam teeth with the corresponding cam 62. A recess or valley 64 and 66 is formed in the top portion 16 of the razor to cooperate with an elongated cam such as 68 formed on and along the full length of the opposite side of the blade 26 from each of the earns 62. Therefore, as the blade is moved inwardly as described above, the cam 68 will move into the valley or recess 64 thereby moving the blade upwardly. This is possible due to the temper of the blade 26. This motion will continue until the camming teeth 60 no longer contact the cam 62. When this last condition occurs, the springs 54 which have been compressed during the inward movement of the blade, will push the blade outwardly of the razor. However, the cam 68 on the blade 26 will retrace its path from the valley 64 and therefore the resultant motion will be downwardly and outwardly thereby producing a cutting stroke of the blade on the shaving area. It should of course be noted that the blade is under proper tension at all times but is allowed to move backward and forward due to the bearings 18 and 22 during the aforementioned movement. It should also be appreciated, that the same motion may be accomplished by using the cam wheel 58 in lieu of the cam wheel 56.

To summarize the operation of the device, it will be appreciated, that the blade 26 is first placed on the mount 28 and the springs 54 are compressed to pass within the cross-shaped groove 52 and abut the lateral edges thereof.

The top of the razor is then threaded into the body portion 14 and handle 12 by means of the threaded member 44- entering the threaded recess 46. The pins 36 and 38 carried by the body portion 14 enter the apertures 34 and 35 in the top portion to properly align the two parts. The blade is thus clamped and properly tensioned at the correct cutting angle between the roller bearings 18, 20 and 22, 24. However, due to this connection the blade is adapted to slide inwardly and outwardly of the razor. It also should be appreciated that in lieu of roller bearings such as disclosed, suitable ball bearings may be used. The cam wheel 56 is then rolled down the shaving area and the blade will move backwardly and upwardly. When the camming teeth 60 clear the cam 62, the springs 54 which have been compressed will push the blade downwardly and outwardly providing a cutting stroke. The combination of the downward pull on the razor and the action of the springs 54 combine to provide a speedier cutting stroke.

It should also be appreciated that in the razor disclosed herein the upward and rearward stroke helps to set up the whiskers for the downward or cutting stroke. Also, the rotating motion of the cam wheel 56 or 58 will push lather into the razor blade rather than pushing it away which helps to soften and stand the whiskers up for the cutting action. Furthermore, the rotating motion of the cam wheel provides an invigorating massage action for the face. Furthermore, the edge of the blade as it moves does not describe an are which will cause gouging of the skin but rather provides for substantially linear up-anddown motion which when considered with the foregoing enables the user to realize a comfortable and more rapid shave.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A razor blade for use with a razor adapted to impart movement thereto, said blade comprising a fiat body having upper and lower faces and opposed cutting edges along the length thereof, and a pair of cam projections on said body adjacent each of said cutting edges, the cam projections of each pair projecting in opposite directions, one from the upper face and one from the lower face.

2. The razor blade of claim 1 wherein each of said cam projections is elongated and orientated parallel to the adjacent cutting edge.

3. The razor blade of claim 2 wherein each of said cam projections is of a length substantially equal to the length of the adjacent cutting edge.

4. A razor blade for use with a razor adapted to impart reciprocal movement thereto, said blade comprising a thin flat body having upper and lower faces and at least one sharp cutting edge along the length thereof, and a pair of elongated cam projections on said body projecting in opposite directions adjacent said cutting edge, one of said projections extending upwardly from said upper face and one of said projections depending downwardly from said lower face.

References Cited by the Examiner UNITED STATES PATENTS 2,009,402 7/1935 Johnston 30351 X 2,066,215 12/1936 Mignon 30-46 2,090,181 8/1937 Bunnell 3046 2,116,280 5/1938 Parkin 3046 2,125,501 8/1938 Holtzman 30351 X 2,125,502 8/1938 Holtzman 30-351 WILLIAM FELDMAN, Primary Examiner.

MYRON C. KRUSE, Examiner. 

1. A RAZOR BLADE FOR USE WITH A RAZOR ADAPTED TO IMPART MOVEMENT THERETO, SAID BLADE COMPRISING A FLAT BODY HAVING UPPER AND LOWER FACES AND OPPOSED CUTTING EDGES ALONG THE LENGTH THEREOF, AND A PAIR OF CAM PROJECTIONS ON SAID BODY ADJACENT EACH OF SAID CUTTING EDGES, THE CAM PROJECTIONS OF EACH PAIR PROJECTING IN OPPOSITE DIRECTIONS, ONE FROM THE UPPER FACE AND ONE FROM THE LOWER FACE. 